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<h3 class="section" id="Support-for-torture-testing-using-multiple-options"><span>7.9 Support for torture testing using multiple options<a class="copiable-link" href="#Support-for-torture-testing-using-multiple-options"> &para;</a></span></h3>

<p>Throughout the compiler testsuite there are several directories whose
tests are run multiple times, each with a different set of options.
These are known as torture tests.
<samp class="file">lib/torture-options.exp</samp> defines procedures to
set up these lists:
</p>
<dl class="table">
<dt><code class="code">torture-init</code></dt>
<dd><p>Initialize use of torture lists.
</p></dd>
<dt><code class="code">set-torture-options</code></dt>
<dd><p>Set lists of torture options to use for tests with and without loops.
Optionally combine a set of torture options with a set of other
options, as is done with Objective-C runtime options.
</p></dd>
<dt><code class="code">torture-finish</code></dt>
<dd><p>Finalize use of torture lists.
</p></dd>
</dl>

<p>The <samp class="file">.exp</samp> file for a set of tests that use torture options must
include calls to these three procedures if:
</p>
<ul class="itemize mark-bullet">
<li>It calls <code class="code">gcc-dg-runtest</code> and overrides <var class="var">DG_TORTURE_OPTIONS</var>.

</li><li>It calls <var class="var">${tool}</var><code class="code">-torture</code> or
<var class="var">${tool}</var><code class="code">-torture-execute</code>, where <var class="var">tool</var> is <code class="code">c</code>,
<code class="code">fortran</code>, or <code class="code">objc</code>.

</li><li>It calls <code class="code">dg-pch</code>.
</li></ul>

<p>It is not necessary for a <samp class="file">.exp</samp> file that calls <code class="code">gcc-dg-runtest</code>
to call the torture procedures if the tests should use the list in
<var class="var">DG_TORTURE_OPTIONS</var> defined in <samp class="file">gcc-dg.exp</samp>.
</p>
<p>Most uses of torture options can override the default lists by defining
<var class="var">TORTURE_OPTIONS</var> or add to the default list by defining
<var class="var">ADDITIONAL_TORTURE_OPTIONS</var>.  Define these in a <samp class="file">.dejagnurc</samp>
file or add them to the <samp class="file">site.exp</samp> file; for example
</p>
<div class="example smallexample">
<pre class="example-preformatted">set ADDITIONAL_TORTURE_OPTIONS  [list \
  { -O2 -ftree-loop-linear } \
  { -O2 -fpeel-loops } ]
</pre></div>

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